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Method for controlling participation in power grid frequency modulation by use of power-grid-friendly type equipment

A control method and friendly technology, applied in the direction of electrical components, circuit devices, AC network circuits, etc., can solve problems such as the impact of equipment use, achieve high economy, save construction costs, and facilitate the accuracy and effectiveness of frequency modulation Effect

Active Publication Date: 2016-10-26
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Purpose of the invention: In order to solve the problem that the control strategy of grid-friendly equipment in the prior art easily affects the use of equipment, this invention proposes a control method for grid-friendly equipment to participate in grid frequency regulation

Method used

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  • Method for controlling participation in power grid frequency modulation by use of power-grid-friendly type equipment
  • Method for controlling participation in power grid frequency modulation by use of power-grid-friendly type equipment
  • Method for controlling participation in power grid frequency modulation by use of power-grid-friendly type equipment

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Experimental program
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Embodiment 1

[0027] Such as figure 1 As shown, the control method for grid-friendly equipment participating in grid frequency regulation in the present invention includes the following steps:

[0028] (1) Determine the grid-friendly equipment that can participate in grid frequency regulation in the grid. The conditions for grid-friendly equipment to participate include: a) having participation rights, such as permission from the user, b) installing control equipment, and being able to detect grid In the change of medium frequency, c) the response speed is fast, and the second-level response speed is selected in the present invention. The response in the present invention refers to that the grid-friendly equipment is shut down according to the change of the grid frequency to reduce the consumption of active power in the entire grid, or is Turn on to increase the consumption of active power in the entire grid;

[0029] (2) Obtain the response characteristics of the above-mentioned grid-frie...

Embodiment 2

[0038] In this example, for a microgrid with a rated capacity of 1MW, the total capacity Q of all grid-friendly equipment that can participate in power system frequency regulation gf =0.15MW, that is, the sum of the maximum response capacity of each device is 0.15MW. Assume that the system suddenly has a 0.2MW active power deficit (ΔP d =0.2MW), and taking into account the uncertainty of the amount of active power reduction and the delay uncertainty of the control signal.

[0039] Obtain the minimum turn-on time Δt of these devices through experiments or device and controller parameters on and the minimum off time Δt off Δt on1 =Δt off1 =1s, active power reduction uncertainty ΔP u％ ±10%, this value represents the deviation between the actual response and the expected response. The historical frequency drop of the power grid in this area ranges from 0.1 to 0.3, so the maximum frequency drop of 0.3 corresponds to the maximum response capacity of grid-friendly equipment 0.1...

Embodiment 3

[0044] In this embodiment, the range of power grid frequency drop is 0.05-0.4, and the minimum turn-on time Δt is obtained through experiments or equipment and controller parameters on and the minimum off time Δt off , the minimum turn-on time Δt on and the minimum off time Δt off The smaller it is, the faster the adjustment response speed is. Let the sum of the maximum response capacity of all equipment be 0.15MW, and the maximum response capacity of each cluster is 0.05MW. The control signal delay Δt is obtained from the communication system parameters c 0~0.1s, the response parameters are shown in Table 2:

[0045] Table 2 Parameter table of 3 GFD clusters participating in frequency regulation

[0046]

[0047] It can be seen from Table 2 that in this embodiment, all grid-friendly devices that can participate in frequency regulation in the grid are set according to the minimum turn-on time Δt on and the minimum off time Δt off Divided into 3 clusters, cluster 1 has ...

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Abstract

The invention discloses a method for controlling participation in power grid frequency modulation by use of power-grid-friendly type equipment. By taking the power-grid-friendly type equipment as a power grid frequency modulation resource, based on an acquired local frequency, according to a preset threshold interval, active power response of the power-grid-friendly type equipment participating in power grid frequency modulation is asynchronously controlled in a segmented mode, when a power grid frequency is quite low, active power consumption of the power-grid-friendly type equipment is reduced, accordingly, an active power vacancy in a power grid is reduced, and the method can help the power grid to recover frequency stability as soon as possible; and furthermore, in a response process, according to actual switching-off time and a minimal switching-on time constraint of the power-grid-friendly type equipment, an equipment cluster with a quite rapid response speed is enabled to respond preferentially. According to the method for controlling the participation in the power grid frequency modulation by use of the power-grid-friendly type equipment, a step response strategy is employed according to an actual frequency deviation amount and the active vacancy, such that the problem of over response or insufficient response is effectively alleviated, and optimization of the power grid frequency modulation is facilitated.

Description

technical field [0001] The invention relates to the field of power system control optimization, in particular to a control method for using grid-friendly equipment of grid users to participate in power system frequency regulation. Background technique [0002] The power industry bears the country's main energy demand and is a basic industry related to national stability and economic development. The power system has a strong particularity. The extensive interconnection of the power grid makes the regional power grids affect each other. The collapse of a regional power grid may trigger a chain reaction. Therefore, it is particularly important to ensure the stable operation of the power system. [0003] Frequency stability is the core content of the safe and stable operation of the power grid, and it is also an important research field of power grid security and stability technology. Traditional power system frequency regulation is mainly undertaken by frequency regulation pow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00
CPCH02J3/00
Inventor 李扬吴奇珂陈昕儒
Owner SOUTHEAST UNIV
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